Views: 2453 Author: Site Editor Publish Time: 2020-07-10 Origin: Site
The sealing material refers to the joints, cracks, door and window frames, glass perimeters, and pipe joints or connections with other structures filled in the building. It can block the medium through the leakage channel and play the role of water tightness and air tightness material. seal materials include metallic materials (aluminum, lead, indium, stainless steel, etc.), non-metallic materials (rubber, plastic, ceramic, graphite, etc.), composite materials (such as rubber-asbestos board, aerogel felt-polyurethane), Next, we mainly introduce common sealing materials.
Polytetrafluoroethylene (PTFE) is added to the strands during manufacturing and then woven. This manufacturing process reduces the disadvantages of central drying. It is suitable for rotating, reciprocating machines, and medium-strength acids and Alkali, petroleum, synthetic oil, solvent and steam and other media. The highest pressure resistance is 3.5MPa, the highest temperature resistance is 290 ℃, and the low temperature resistance is -110 ℃.
Synthetic fibers are combined at the corners of the packing to make a durable, pollution-free and wear-resistant packing. It is suitable for the medium of acid, alkali, gas, petroleum, synthetic oil, steam, brine and mud. The highest temperature resistance is 290 ℃, the low temperature resistance is -110 ℃, the highest pressure resistance is 3.5 ~ 17.5MPa, and the rotation speed is 2250r / min.
It is made of ordinary braided man-made fiber, contains mineral lubricants and is treated with black lead. The texture is very soft and easy to install. For old and large-tolerance mechanical equipment or slightly worn shafts, the sealing effect is the most good. It is suitable for high speed, low pressure to medium pressure rotary pumps, mixers, etc.
PTFE is characterized by low coefficient of friction, no pollution, and 100% corrosion resistance, so it is widely used. Style5889 is made of internal and external staggered lattice weaves, with special lubricants, soft texture, long durability and long life. It is suitable for pharmaceutical, oil refining, chemical and cosmetic industries. The maximum pressure resistance is 10 MPa, the maximum temperature resistance is 104 ℃, and the rotation speed is 1500 r / min.
Specially selected long hemp fiber, first knit into strands, and then impregnated with PTFE, and then made by ordinary weaving method, it is added with special lubricants, tough and durable characteristics. Immersed in seawater for a long time, it is not easy to rot. This applies to ships, pulp, sugar, and power industries. The highest pressure resistance is 5 MPa, the highest temperature resistance is 104 ℃, and the rotation speed is 1200 r / min.
The inner core of the packing is made of asbestos fiber, graphite sheet, anti-rust zinc powder and a small amount of adhesive. The jacket is 90% pure white asbestos plus alloy steel wire lining. The surface is graphite powder and treated with anti-rust agent. The highest pressure resistance is 28 MPa, and the highest temperature resistance is 620 ℃.
From the above, we can see that the application fields of the seals with different sealing materials are different. Which seal do you want to buy?